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Implement combination of boolean not with branch

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llvm-svn: 6599
This commit is contained in:
Chris Lattner 2003-06-04 04:46:00 +00:00
parent ce0e236e49
commit b2ea03d03a
1 changed files with 14 additions and 0 deletions
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14
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -76,6 +76,7 @@ namespace {
Instruction *visitPHINode(PHINode &PN);
Instruction *visitGetElementPtrInst(GetElementPtrInst &GEP);
Instruction *visitAllocationInst(AllocationInst &AI);
Instruction *visitBranchInst(BranchInst &BI);
// visitInstruction - Specify what to return for unhandled instructions...
Instruction *visitInstruction(Instruction &I) { return 0; }
@ -1061,6 +1062,19 @@ Instruction *InstCombiner::visitAllocationInst(AllocationInst &AI) {
return 0;
}
Instruction *InstCombiner::visitBranchInst(BranchInst &BI) {
// Change br (not X), label True, label False to: br X, label False, True
if (BI.isConditional() && BinaryOperator::isNot(BI.getCondition())) {
BasicBlock *TrueDest = BI.getSuccessor(0);
BasicBlock *FalseDest = BI.getSuccessor(1);
// Swap Destinations and condition...
BI.setCondition(BinaryOperator::getNotArgument(cast<BinaryOperator>(BI.getCondition())));
BI.setSuccessor(0, FalseDest);
BI.setSuccessor(1, TrueDest);
return &BI;
}
return 0;
}
void InstCombiner::removeFromWorkList(Instruction *I) {